Challenge

Week 4.2: Project - Transient simulation of flow over a throttle body

Aim:

Aim:-

Set the transient-state simulation for flow over throttle body case setup in the converge.
Export all the input files and run the simulation using Cygwin.
Converge plot for velocity, pressure, mass flow rate, and total cell count.
create animations of velocity and pressure contours plot for the flow inside the elbow pipe in which the throttle movement should be visible.
Show mesh (i.e surface with edges) by creating a mid surface/slice along the z-direction.
Explain the plots and write a detailed report on the project.
Create another animation in Paraview representing streamline flow over throttle with transient state simulation.

Objective:-

Import the throttle geometry model in the converge using the create option.
Perform Geometry cleanup.
Define the boundary to each surface of the geometry.
Set normal direction on the inward side of the surfaces. means, define the direction towards the volume where the fluid is present.
In case of setup define the material, simulation parameters, fluid region, boundary condition, no of cycles, grid definition.
Extract the setup files in the simulation folder.
Run exported input setup files in Cygwin.
Post-process all the results into 3D outputs and open in Paraview.
Show mesh generation on the 2D mid surface by using the slice command from the Paraview.
Plot converge plot for velocity, pressure, mass flow rate, and total cell count.
Create animations in the Paraview to show the changes in velocity and pressure contour with the throttle movement
Create other animations to show the streamlines of the flow over the throttle body.
Explain the plot animations and write a detailed report on the project.

Procedure:

Load the case setup file for steady state flow and make the following changes.

In run parameters select the transient solver

In Simulation time parameters, End time is 4*time for flow to take place through the pipe=4*vel*char length=0.01 secs.

Now go to boundary and for throttle , Select boundary type as wall and wall motion type as rotating.

To get the centre point of the valve rotation,

Go to measure> Direction > Arc Normal select three points and click apply.

Copy the arc centre coordinates.

Contour plots:

Open paraview and load.vtm file

In view> Multiblock Inspector > uncheck cell data.

Surface with edges

Plots:

Cell count

Mass Flow rate

pressure:

Velocity: